| 摘要 |
PROBLEM TO BE SOLVED: To cope with power measurement in various kinds of circuit systems including a three-phase four-line circuit with one model by providing a plurality of voltage and current input means of a three-phase or single-phase electric circuit and a means for setting a circuit system. SOLUTION: The multiple-circuit-type wattmeter is provided with, for example, voltage input means 9 and 10, power input means 11 and 12, and a circuit system setting means 13 for setting the circuit system of an electric circuit being measured by three-phase three-wire, single-phase three-wire, single-phase two-wire, three-phase four-wire, or the like. And, when the circuit system is set to three-phase four-wire, both the voltage input means 9 and 10 and voltage input means 11 and 12 become the input wire of single-phase three-wire, add each phase power for two circuits of the single-phase three-wire by a power measurement means 14, and measures the power of the three-phase four-wire. An watthour can also be metered by the similar method. The watthour can be grasped individually for each phase. Measurement can be made by performing each specific setting for the cases of single-phase three-wire, single-phase two- wire, and three-phase three-wire systems. |
